C# Class Mapsui.Geometries.Utilities.CGAlgorithms

Specifies and implements various fundamental Computational Geometric algorithms. The algorithms supplied in this class are robust for double-precision floating point.

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Public Methods

Method	Description
ClosestPoint ( System.Point p, System.Point lineSegFrom, System.Point lineSegTo ) : System.Point	Computes the closest point on this line segment to another point.
DistanceLineLine ( System.Point a, System.Point b, System.Point c, System.Point d ) : double	Computes the distance from a line segment AB to a line segment CD. Note: NON-ROBUST!
DistancePointLine ( System.Point p, System.Point a, System.Point b ) : double	Computes the distance from a point p to a line segment AB. Note: NON-ROBUST!
DistancePointLinePerpendicular ( System.Point p, System.Point a, System.Point b ) : double	Computes the perpendicular distance from a point p to the (infinite) line containing the points AB
Length ( IList pts ) : double	Computes the length of a linestring specified by a sequence of points.
Project ( System.Point p, System.Point lineSegFrom, System.Point lineSegTo ) : System.Point	Compute the projection of a point onto the line determined by this line segment. Note that the projected point may lie outside the line segment. If this is the case, the projection factor will lie outside the range [0.0, 1.0].
ProjectionFactor ( System.Point p, System.Point lineSegFrom, System.Point lineSegTo ) : double	Compute the projection factor for the projection of the point p onto this `LineSegment`. The projection factor is the constant k by which the vector for this segment must be multiplied to equal the vector for the projection of p.
SignedArea ( System.Point ring ) : double	Returns the signed area for a ring. The area is positive ifthe ring is oriented CW.

Method Details

ClosestPoint() public static method

Computes the closest point on this line segment to another point.

public static ClosestPoint ( System.Point p, System.Point lineSegFrom, System.Point lineSegTo ) : System.Point
p	System.Point
lineSegFrom	System.Point
lineSegTo	System.Point
return	System.Point

DistanceLineLine() public static method

Computes the distance from a line segment AB to a line segment CD. Note: NON-ROBUST!

public static DistanceLineLine ( System.Point a, System.Point b, System.Point c, System.Point d ) : double
a	System.Point	A point of one line.
b	System.Point	The second point of the line (must be different to A).
c	System.Point	One point of the line.
d	System.Point	Another point of the line (must be different to A).
return	double

DistancePointLine() public static method

Computes the distance from a point p to a line segment AB. Note: NON-ROBUST!

public static DistancePointLine ( System.Point p, System.Point a, System.Point b ) : double
p	System.Point	The point to compute the distance for.
a	System.Point	One point of the line.
b	System.Point	Another point of the line (must be different to A).
return	double

DistancePointLinePerpendicular() public static method

Computes the perpendicular distance from a point p to the (infinite) line containing the points AB

public static DistancePointLinePerpendicular ( System.Point p, System.Point a, System.Point b ) : double
p	System.Point	The point to compute the distance for.
a	System.Point	One point of the line.
b	System.Point	Another point of the line (must be different to A).
return	double

Length() public static method

Computes the length of a linestring specified by a sequence of points.

public static Length ( IList pts ) : double
pts	IList	The points specifying the linestring.
return	double

Project() public static method

Compute the projection of a point onto the line determined by this line segment. Note that the projected point may lie outside the line segment. If this is the case, the projection factor will lie outside the range [0.0, 1.0].

public static Project ( System.Point p, System.Point lineSegFrom, System.Point lineSegTo ) : System.Point
p	System.Point
lineSegFrom	System.Point
lineSegTo	System.Point
return	System.Point

ProjectionFactor() public static method

Compute the projection factor for the projection of the point p onto this LineSegment. The projection factor is the constant k by which the vector for this segment must be multiplied to equal the vector for the projection of p.

public static ProjectionFactor ( System.Point p, System.Point lineSegFrom, System.Point lineSegTo ) : double
p	System.Point
lineSegFrom	System.Point
lineSegTo	System.Point
return	double

SignedArea() public static method

Returns the signed area for a ring. The area is positive ifthe ring is oriented CW.

public static SignedArea ( System.Point ring ) : double
ring	System.Point
return	double